Update - 10/20/19: Adjusted Tensioner Case and Cap. One plug of the case may collide with a screw so you should snip it shorter 2mm with clippers to make it fit snug. Cap for the side print bolt is tighter to prevent thread slippage.
Update - 10/10/19 : Afraid of the bolt breaking from layer separation? There's now a side-friendly print version of the Tension Bolt and the Tension Case to accompany it!
Ender 3 or Pro X-Axis Belt Tensioner for short belts. Found the original version was too tight for my belt and remixed this one for the tighter belt that my 3D printer has.
It only tightens the belt up to an additional ~10mm but my belt is already somewhat tight on installation alone.
I made several revisions:
-tensioner case allows looser initial belt position for easier installation
-tensioner bolt allows tightening of the bolt onto the bearings with no issue
-different bolt and case alignment method
I recommend the slightly higher infill and lower resolution for the Bolt and Cap for the threads. The case should print fine at 0.2mm and 15%.
Use 2 or more walls and print in the same orientation as the .stl files.
Disassemble your stock Ender 3 x-axis belt tensioner
Keep the 2 bearings, the bolt, and the ending hex nut
Take the x belt and place it on top of the x gantry
Install the Tensioner Case onto the gantry
Insert Tensioner Bolt into case
Place the bearings through the belt in its proper position
Drop the belt and bearings into the T-Bolt-Case assembly
Place bolt through bearings and T-bolt (tip: use your allen key to leverage it through the holes)
Screw hex nut on to other end
Push hex nut flush, and tighten bolt and hex nut
Screw on Tension Cap as tight as desired
- Make sure your belt doesn't rub against the gantry and test bumpiness of the axis